Internal calibration network unit for reflective surface satellite-borne SAR system and internal calibration method

A network unit, internal calibration technology, applied in radio wave measurement systems, radio wave reflection/re-radiation, utilization and re-radiation, etc., can solve problems such as can not be directly used

Active Publication Date: 2018-09-21
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

The above characteristics determine that the internal calibration method of ultra-broadband reflector spaceborne SAR is quite ...

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  • Internal calibration network unit for reflective surface satellite-borne SAR system and internal calibration method
  • Internal calibration network unit for reflective surface satellite-borne SAR system and internal calibration method
  • Internal calibration network unit for reflective surface satellite-borne SAR system and internal calibration method

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[0075] The technical contents of the present invention include the following three items: 1) first, the internal calibration loop and the internal calibration network module are designed according to the load scheme of the ultra-wideband reflector spaceborne SAR, to ensure full coverage of the system's transceiver channels; 2) secondly, the design The internal calibration workflow of the system combining phase calibration and acquisition of channel amplitude and phase characteristics is presented; 3) Finally, a processing algorithm for obtaining distance compression matching templates using internal calibration signals is given.

[0076] 1. Internal calibration loop and internal calibration network design of UWB reflector SAR

[0077] The internal calibration loop of ultra-wide reflector spaceborne SAR needs to meet the following three constraints:

[0078] (1) The calibration loop must ensure full coverage of all paths experienced by the radar imaging pulse;

[0079](2) The ...

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Abstract

The invention relates to an internal calibration network unit for an SAR system and an internal calibration method matched with the internal calibration network unit, and realizes internal calibrationof an ultra-wideband reflective surface satellite-borne SAR by adding the internal calibration network unit in the SAR system. According to the invention, a purpose of improving an SAR imaging effectis achieved by correcting a channel deviation to increase a signal-to-noise ratio of an SAR image; calibration of magnitude-phase characteristics of all transmitting channels and receiving channels can be realized by using an internal calibration network; firstly, phase calibration is performed by transmitting dot frequency pulse signals to ensure phase consistency; and then, channel magnitude-phase characteristics of sweep-frequency pulse signals are transmitted to ensure accuracy of the calibration.

Description

technical field [0001] The invention relates to an internal calibration network unit of an ultra-wideband space-borne SAR system and a corresponding internal calibration method, belonging to the technical field of space microwave remote sensing. Background technique [0002] In order to achieve high-quality imaging of ultra-high resolution spaceborne SAR systems, it is necessary to accurately calibrate the actual on-orbit characteristics of the system's transceiver channels. On the one hand, it corrects the deviation of channel characteristics caused by factors such as temperature changes and aging effects, and on the other hand, it obtains matching templates through the processing of calibration signals to ensure the imaging effect of range compression. [0003] Due to its ultra-high resolution characteristics, ultra-high resolution spaceborne SAR has the characteristics of ultra-wideband, multiple transmit and multiple receive channels. At the same time, the ultra-high-re...

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Application Information

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IPC IPC(8): G01S7/40G01S13/90
CPCG01S7/4004G01S13/90
Inventor 冯帆孙嘉金阿鑫李斌张晓阳侯若涵党红杏谭小敏
Owner XIAN INSTITUE OF SPACE RADIO TECH
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